diff --git a/FHEM/00_TUL.pm b/FHEM/00_TUL.pm
index f59203187..12f239bcd 100644
--- a/FHEM/00_TUL.pm
+++ b/FHEM/00_TUL.pm
@@ -138,6 +138,8 @@ TUL_Set($@)
   my $arg = join("", @a);
   my $ll = GetLogLevel($name,3);
 
+  return "No $a[1] for dummies" if(IsDummy($name));
+
   if($type eq "raw") {
     Log $ll, "set $name $type $arg";
     TUL_SimpleWrite($hash, $arg);